Oxidation behavior of MnCuNiFeZnAl damping alloy under varied high temperatures

High-entropy Mn-based damping alloys, such as MnCuNiFeZnAl with a mixing entropy of 9.39 Jmol −1 K −1 , are promising for high-temperature use. In-situ XRD shows oxidation starts at 673 K, forming MnO, ZnO, and CuO, followed by Mn 3 O 4 and Mn 2 O 3 . The alloy demonstrates enhanced antioxidation performance due to a continuous Al 2 O 3 film near the oxidation film/matrix interface but is prone to oxide scale detachment at high temperatures. Splitting of MnO diffraction peaks arises from Mn 2 O 3 /Mn 3 O 4 redox reactions or replacement of MeO (Zn, Cu, Ni, Fe) by Mn.